<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>运算符</title>
  </head>
  <body>
    <script>
      var age = 20;
      var _age = "20";

      document.write(age == _age);
      document.write("=====");
      document.write(age === _age);
    </script>
  </body>
</html>
